<template>
    <div>
        <h3>数据报表</h3>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <div id="main" style="width:750px;height:400px;"></div>
        </el-card>
    </div>
</template>
    
<script>
//导入echarts
import * as echarts from 'echarts';
//导入lodash
import _ from 'lodash'

export default {
    name: 'Report',
    data() {
        return {
            //需要跟请求的折线图数据合并的options
            options: {
                title: {
                    text: '用户来源'
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross',
                        label: {
                            backgroundColor: '#E9EEF3'
                        }
                    }
                },
                grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                },
                xAxis: [
                    {
                        boundaryGap: false
                    }
                ],
                yAxis: [
                    {
                        type: 'value'
                    }
                ]
            }
        }
    },
    async mounted() {
        //在页面dom元素加载完毕之后执行的钩子函数mounted
        // 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))
        //准备数据和配置项
        //发送请求获取折线图数据
        const { data: res } = await this.$http.get('reports/type/1')

        if (res.meta.status !== 200) {
            return this.$message.error('获取折线图数据失败')
        }

        //合并res.data和this.options
        const result = _.merge(res.data, this.options)

        // 使用获取的数据展示图表
        myChart.setOption(result)
    },
    methods: {

    }
}
</script>

<style lang="less" scoped></style>